CVE-2026-58213 NATS Server: MQTT SUBSCRIBE Protocol Injection via Leaf Node/Route Forwarding allows arbitrary NATS command injection
An MQTT client can inject arbitrary NATS protocol commands via subscription filters, potentially leading to unauthorized operations or data modification.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-58213?
CVE-2026-58213 is a high-severity command injection vulnerability in nats-io nats-server, published on 8 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.1 and 2.12.9, an MQTT client could include protocol control characters in subscription filters that were later forwarded as NATS protocol data to route or leafnode connections, corrupting the forwarded protocol stream and allowing injection of unintended NATS protocol operations. This issue is fixed in versions 2.14.1 and 2.12.9.
Weakness: CWE-74
Which versions are affected by CVE-2026-58213?
1 open source package ship an affected version, including nats. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
nats Bitnami | All versions | 2.12.9, 2.14.1 |
Products include Linuxfoundation Nats-Server.
How do I fix CVE-2026-58213?
Upgrade nats to a fixed version for your release line: 2.12.9 or 2.14.1.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-58213 being exploited?
There is no known exploitation of CVE-2026-58213 in the wild and no public exploit code.
Other vulnerabilities in nats-io nats-server
- CVE-2022-28357 NATS nats-server allows directory traversal via unintended path to a management action
- CVE-2026-58253 NATS Server: Route API Auth Bypass
- CVE-2022-24450 Incorrect Authorization in NATS nats-server
- CVE-2026-33216 NATS has MQTT plaintext password disclosure
- CVE-2026-58207 NATS Server: Remote crash via integer overflow in Connz pagination
Sources
Also known as BIT-nats-2026-58213, DEBIAN-CVE-2026-58213, GHSA-qrcv-3558-gj4f, JLSEC-2026-1148, MINI-7rh5-pqpp-f6mx, MINI-8gh5-cm2c-gcc4 and 1 more.